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Aquaporin 4 is a ubiquitously expressed isoform in the dogfish (Squalus acanthias) shark

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Cramb_2012_FIP_Aquaporin.pdf (1.766Mb)
Date
10/01/2012
Author
Cutler, Christopher Paul
McIver, Bryce
Cramb, Gordon
Zeidel, Mark
Funder
NERC
The Wellcome Trust
Grant ID
NE/E015514/1
Keywords
Aquaporin 4
Ahark
Dogfish
Kidney
Liver
Rectal gland
Gill
Cardiac stomach
QH301 Biology
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Abstract
The dogfish ortholog of aquaporin 4 (AQP4) was amplified from cDNA using degenerate PCR followed by cloning and sequencing. The complete coding region was then obtained using 5′ and 3′ RACE techniques. Alignment of the sequence with AQP4 amino acid sequences from other species showed that dogfish AQP4 has high levels (up to 65.3%) of homology with higher vertebrate sequences but lower levels of homology to Agnathan (38.2%) or teleost (57.5%) fish sequences. Northern blotting indicated that the dogfish mRNA was approximately 3.2 kb and was highly expressed in the rectal gland (a shark fluid secretory organ). Semi-quantitative PCR further indicates that AQP4 is ubiquitous, being expressed in all tissues measured but at low levels in certain tissues, where the level in liver > gill > intestine. Manipulation of the external environmental salinity of groups of dogfish showed that when fish were acclimated in stages to 120% seawater (SW) or 75% SW, there was no change in AQP4 mRNA expression in either rectal gland, kidney, or esophagus/cardiac stomach. Whereas quantitative PCR experiments using the RNA samples from the same experiment, showed a significant 63.1% lower abundance of gill AQP4 mRNA expression in 120% SW-acclimated dogfish. The function of dogfish AQP4 was also determined by measuring the effect of the AQP4 expression in Xenopus laevis oocytes. Dogfish AQP4 expressing-oocytes, exhibited significantly increased osmotic water permeability (Pf) compared to controls, and this was invariant with pH. Permeability was not significantly reduced by treatment of oocytes with mercury chloride, as is also the case with AQP4 in other species. Similarly AQP4 expressing-oocytes did not exhibit enhanced urea or glycerol permeability, which is also consistent with the water-selective property of AQP4 in other species.
Citation
Cutler , C P , McIver , B , Cramb , G & Zeidel , M 2012 , ' Aquaporin 4 is a ubiquitously expressed isoform in the dogfish (Squalus acanthias) shark ' , Frontiers in Physiology , vol. 2 , 00107 . https://doi.org/10.3389/fphys.2011.00107
Publication
Frontiers in Physiology
Status
Peer reviewed
DOI
https://doi.org/10.3389/fphys.2011.00107
ISSN
1664-042X
Type
Journal article
Rights
Copyright © 2012 Cutler, MacIver, Cramb and Zeidel. This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited.
Description
Christopher P.Cutler is in receipt of a grant from the National Science Foundation, NSFIOS0844818.
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  • Medicine Research
  • University of St Andrews Research
URL
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3254168/pdf/fphys-02-00107.pdf
URI
http://hdl.handle.net/10023/4985

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